Sander or polishing-machine.



H. W. SBLLNER.

SANDER OR POLISHING MACHINE.

APPLICATION FILED MAY 14, 1909.

Patented N0v.'8,191().

being disclosed in the following views and adapted to be applied to the surface to F will flpermit the ma'chlne to be placed upon interchange of a coarse medium for one of HERBERT w. SELIQNER, or

SANDER on romaine-MACHINE.

Specification of Letters FPa tent.

FAR-IBAULT, MINNESOTA.

Patented ov. 8, 1910.

Application filed May 14, 1909. Serial Moi-95,847;

To all whom it may concern: i Be it known that I HERBERT W. SELLNER, Q citizen of the United States, residin ,atf Faribault, in the county of Rice and tate of Minnesota, have invented certain new and 5 useful Improvements in Sanders'or Polishf ing-Machines, of which the following is as specification.

My invention relates to abrading or P017 i'shing machines of the class employing an" endless belt carrying the abrading agent be treated, the particular type of device un-w er consideration referring to portable apparatus arranged to be manually guided upon the work.

The chief objects of the improvements which form the subject matter of this application are to furnish simple and efiective mechanism for accomplishing the purpose sought; to provide an abrading or polishing machine of the variety specified in which the tension of the belt may be readily adjusted and to supply a 1i ht construction that may be readily handle so that the required results may be rapidly accomplished.

Further objects stated in detail are :to provide yielding supports or fenders that the cor or bench without danger of bringing the abrading member. in contact with the supporting surface; to furnish a rigid but flexible supporting means for the abrad ing element and to so arrange the attachment for the abrading element or member that it can be readily removed when worn out, or damaged, and another one substituted, thus presenting the advantage of allowing the finer texture, thus permitting the machine to be used either as a sander or a polisher, as occasion may require.

I accomplish the desired results by means of the ap aratu's illustrated in the accompanying diawing, which forms a part of this application, the details of importance Figure 1 is a side elevation of the complete machine; Fig. 2 is a sectional view on the line 22 of Fig. 1, and Fig. 3 is an enlarged fragmentary view of a portion of the endless bed showing the manner of attaching the abrading element thereto.

Referring to the details of the drawing the numeral 10 indicates parallel side frame members, from which are suspended presser rails 11,-one upon each side of the machine, c'u-r'ved hanger arms or brackets 12 rigidly connecting them with the frame. From each side member 10 rise two rods 13, having their upper portions bent inward and secured to a plate 14:, which constitutes a ban- 'dl'e, b means of which the device can be i guide upon the work or moved from lace to place as desired. Upon each side o the machine extending parallel with the frame is a protective fender or shoe 15 forming a su port for the machine when not being o'p er'a'ted. The shoes or fenders are suspended by vertical bolt-rods 16 which pass through ears 17 and arms 17 projecting from the. frame member 10, and the presser rail 11,

respectively. The upper ends of the bolts 16 are furnished'with nuts 16*, which rest upon the ears 17, and the lower ends are embraced by coiled springs 18, interposed be tween the shoes and the arms 17 and tending to hold said shoes at their lowest positi'ons.

The frame members 10 are connected at each end of the machine by axles 19, 19

upon which are mounted flanged guide wheels 20, arranged inside of said frame. The forward axle 1-9 is journaled in the frame, while the rear axle 19 is mounted in boxes 21, slidable in slots 21 in the frame ends, and adjustable in said slots by means of screws 22, supported in ears 23. The said wheels 20 are connected by an endless belt carrier or feeding bed, consisting of a series of transversely arranged bars 24:, connected at spaced intervals by a suitable belt or apron 26, secured to their outer faces in any desirable manner. The ends of said bars are notched to form projections or flanges 24 which are supported on, and travel over, the faces of the wheels 20. The sides of the bars 24 are inclined so that the inner faces are narrower than the outer, to permit the carrier or movable bed to assume the proper curvature as it passes around the wheels. Upon the outer surface of. the apron 26 is applied an abrading member 27 in the form of a continuous sheet. When the appliance is used as a sander, this' willusually consist of a layer of sand paper either laid directly upon the apron 26 or provided with a suitable backing to render the article more durable, such construction being usual in abraders of this type, and therefore not shown in the drawing. In order to conveniently secure the sand belt or band 26 in 35 nism the device is moved over the-surface being journaled in bracket 32, attached to paper or other opposition with'the carrier or bed plate, and facilitate its ready removal for any purpose, I make one of the carrier bars a little wider than the others, as indicated at 25, and furnish this key bar with a longitudinal slot 25 having its sides inclined so that the slot is approximately triangular or wedge-shaped shaped key 28 driven-into the slot between the paper ends fromv the rear side, thus clamping the material firmly in position,

so as to permit the proper tension or stretching of the sand paper. v

The movable bed is driven by means of a beveled gear 29, mounted on the outer end of the shaft 19 and receiving motion from a similar gear 29*, carried on a vertical spindle 30, connected by a flexible shaft 31 with any convenient source of power, the 'said'spindle the adjacent frame member 10.

The operation of the machine Will be readily underfifiQQd from the foregoing description of the details and by inspection of the drawing :-When applying the sand Ipolishing element, the feedmg bed will be rst loosened by turning the adjusting screws 22 in the proper direction.

The ends of the sand aper are then drawn through the slot 25 f fomthe narrow side, and the wedge or key inserted in the manner described, after which the device is again tightened by means of the saidscrews.

, Power having been applied to th'emechato be abraded or polished b y means of the handle 14, the pressure being varied at will, so that the abrading surface will bear more or less heavily upon the work, this pressure being resisted to a certain degree by the springs 18. It will not be necessary to stop .the motor when the machine is removed from the work as theresistance of the said springs will be 'sufilcient to raise the entire machine clear of the support upon which the shoes 15 maybe placed.

As the flanges 24 of the bars 24 travel between the wheels20 in their lower'course, they are supported from above and kept in section. The ends 27 of the paper are introduced into this slot and a wedgea true "alinement by means of the presser rails 11, thus causing an even contact of the abradin element over the entire extent of the sur aces'in apposition for this reason producing results more satisfactory than when the polishing material is spread upon rollers or drums which have a smaller proportional area of contact with the work.

I Having thus described my invention, what I claim as new, is I 1. In a polishing machine, the combination with a frame, ofa: pair of axles journaled at opposite ends of the frame, means for adjusting one of said axlesupon the frame, a pair ,of flanged wheels mounted upon each axle, an endless feeding bed comprising a series of connected bars supported at their ends upon the faces ofsaid wheels, one of said bars having a longitudinal slot, an abrading member consisting of a layer of suitable material embracing the endless bed, and having its ends inserted in said slot, a wedge engaging the ends of the abrading member in the slot, and driving mechanism adapted to be attached to a source of power.

2. In a polishing machine, the. combinaw pair of axles jour-- course of the endless bed upon opposite sides,

fenders yieldingly attached to the frame, and driving mechanism adapted to be attached to a source of power.. I

In testimony whereof I afiix my signature in the presence of two witnesses HERBERT W. SELLNER.

Witnesses:

P. F. Boon, T. FLEQKENSTEIN. 

